Internal-combustion engine.



No, 730,626. PATENTBD, JUNE 9, 1903.

F. G. ERIGSON.

INTERNAL COMBUSTION ENGINE.

APPLIGATION FILED AUG. 14, 1902;

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UNITED STATES Yatented June 9, 1903.

PATENT OFFICE.

FRITHIOF GUSTAF ERICSON, OF STOOKHOLM, SWEDEN, ASSIGNOR TO AKTIEBOLAGET SVENSKA MOTOROCH NAF-FABRIKEN, OF STOCK- I-IOLM, SWEDEN.

INTERNAL-COMBUSTION ENGINE.

SPECIFICATION forming part of Letters Patent No. 730,626, dated June 9, 1903.

Application filed August 14, 1902.

To aZZ whom it Ina-y concern: Be it known that I, Fnrrnron Gnsrar Enroson, a subject of the Kin g of Sweden and Norway, and a resident of 6, Teatergatan, Stockholm, Sweden, have invented new and useful Improvements in Internal-Combustion Engines, of which the following is a specifica tion, reference being had to the drawings accompanying and forming part hereof.

The present invention relates to improvements in cam-disks for operating the exhaustvalve in four-stroke internal-combustion engines.

Reversing devices for internal-combustion engines-gas-engines, petroleum-engines, or the likein which Ottos cycle is employed, heretofore known are generally constructed in such manner that part or parts of the engine operating the exhaust-valve must be adjusted in a certain manner each time the engine is to be reversed, and in the most cases the said adjustment cannot be made. without stopping the engine, which, as easily understood, essentially limits the use of the engines of the said kind.

The object of the present invention is to provide a cam-disk for operating the exhaustvalve of the engine, which cam-disk will allow the engine to run in both directions with out adjusting any part or parts of the same.

The invention consists, briefly, in providing on a cam-disk a cam-slot having two symmetrically-arranged parts, each of which is capable of guiding suitable devices, so that the exhaust-valve of the engine will be opened once for every two revolutions of the crankshaft of the engine.

In the accompanying drawings I have illustrated a suitable constructional form of the present invention.

Figure 1 shows in side elevation an internal-combustion enginepro'vided with a ca1ndisk constructed in accopdance with my present invention. Fig.2 shows on an enlarged scale an end view ofsaid ca1n-disk.

Referring to the drawings, the cam-disk 2 is rigidly fixed to the crank-shaft 1 of the engine, the said cam-disk 2 being provided on of its end positions, so as to open the exhaustsaid sliding piece 5 when the cam-disk rothe one of its end surfaces with a cam-slot $erial No. 119,628 (No model.)

having two symmetrical parts 3 and 4, the shape of which is more clearly illustrated in Fig. 2. The arrangements by means of which the said cam-disk operates the exhaust-valve may be carried out in any convenient manner and consists according to the drawings of a sliding piece 5, running in the said cam-slot 3 4 and pivotally fixed to an arm 6, which by means of a pin 7 may be pivotally; connected to the frame of the engine. A roller 11, fixed to a rod 9, which in'well-known manner actu ates the stem 12 of the exhaust valve, is adapted to run on a curved part 10 of the said arm 6 and to be lifted by an ecoentrical part 8 of the same when the said arm 6 is in the one 5 valve. The stem of the latter may, as'usual, be provided with a spring 13, which tends to hold the exhaust-valve in closed position.

Referring to Fig. 2, the arrows shown by full lines inthe part 3 of the cam-slot show the way of the sliding piece 5 when the cam-disk rotates in the direction of the arrow 14, while the arrows shown by dotted lines in the part l of the said cam-slot shows the way of the 7S tates in the opposite direction. 7 If either of the said ways be traced, it will be seen that the said sliding piece 5 passes the outer part of the way 3 or 4 one time for every two revolutions of the cam-disk, thereby turning the arm 6 into the right end position in Fig. 1, so as to effect the opening of the exhaust-valve. In order to prevent the sliding piece from passing over from the way 3 into i, or vice versa, when the cam-disk rotates in one and the same direction, the said arm 6 may be ac tuated by a spring 15, as illustrated in Fig. 1. If the sliding piece 5, as shown by full lines in Fig. 2, runs in the part 3 of the cam-slot and the direction of rotation of the cam-disk 2 be reversed, the sliding piece 5 will run inthe direction of the dotted arrows in said part 8 of the cam-slot and pass into the central part of the latter and thereupon into the part-4 of the same, from which it cannot return unless the direction of rotation of the cam-disk is again changed.

Obviously the cam-disk 2 need not be fixed to the crank-shaft of the engine. It is only necessary that the cam-disk is driven at the same speed. as said shaft and may thus be ar ranged at any suitable place in the engine and be driven in any convenient manner.

Having noW described my invention and in What manner the same may be performed, What I claim as new, and desire to secure by Letters Patent, is

The combination with a four-stroke iniernal-combustion engine, of a cam-disk provided on the one of its side faces with a camlot consisting of two symmetrically-arranged 

